Computation of Three-Dimensional Flow Field Created by Weir-Type Structures

AbstractWeirs are constructed to control flow and to modify instream flow characteristics for river restoration. A clear understanding of their effects on flow by different layouts of the structure is necessary to guide their design for attaining desired results. Numerical modeling and laboratory experiments have been carried out to compare flow structures with linear and folded weirs. A three-dimensional finite volume model with the turbulence closure has been verified and applied for numerical modeling. A good correspondence is observed among the computed flow pattern, surface jet characteristics and laboratory measurements. The results clearly show the sensitivity of the flow pattern with changes in layout. The secondary flow strength and bed shear stresses are enhanced significantly by folded weirs, which induce…